The Blue Caves are a series of stunning sea caves located on the island of Zakynthos in Greece. These caves are famous for their vibrant blue waters, which are created by sunlight reflecting off the white limestone walls. Visitors can explore the caves by boat, enjoying the unique colors and natural formations. The most popular cave is the Blue Grotto, where the water appears especially luminous. The best time to visit is during midday when the sunlight is at its peak, illuminating the cave's interior. The Blue Caves are a popular destination for tourists seeking natural beauty and adventure.